Ferrari where using co2 last year, it behaves very similar to nitrogen in that its pressure doesn't vary much, however it aparently had something to do with blistering

It really depends what type of games you want to make, for very simple 3d ones i would suggest using Windows Presentation Foundation (WPF) because it is very easy. Or you could use Managed Direct X and C#. If you already have C++ experiance then OpenGL is fairly simple to work with aswell. However remember that the maths involved can get pretty heavy and it is quite difficult to do anything in a short period of time

+1

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